Agent Harrier is thrilled to be back for his third secret spy mission, but his excitement is quashed when he discovers HOLES in his precious book. These aren't just ordinary holes, they're PLOT HOLES, and they transport Agent Harrier to different dimensions - first he finds himself in a fairy tale, then a detective novel, then a sci-fi adventure. If Agent Harrier doesn't find the hole-making culprit soon, none of his books will make sense and the whole series will be doomed! Luckily, he has a plot-hole expert in the shape of his trusty friend Mole to help him out. But what if Mole turns out to be . . . THE MOLE?!!!! Readers will double-take at this stylishly metafictional follow-up to This Book Will Self-Destruct and You Only Spy Twice.